False alarm and missing alarm prevention method based on phase sensitive optical time domain reflection sensor

Abstract

The invention discloses a false alarm and missing alarm prevention method based on a phase sensitive optical time domain reflection sensor. The method is characterized in that pulsed light with the width changing according to a fixed rule is injected into a sensing optical fiber, data acquired under different pulse widths are regarded as output of different sensors, a multi-sensor information fusion algorithm is adopted to carry out comprehensive processing on the acquired data, and according to the comprehensive processing result, whether an intrusion event happens along the sensing optical fiber is judged, and the particular intrusion event happening position is determined. The relevance and the difference between sensor data under different pulse widths are thoroughly used, while the sensor hardware cost is not increased, the false alarm rate and the missing alarm rate can be effectively reduced, the algorithm is simple, and the positioning precision is high.

Description

technical field [0001] The invention relates to the field of optical fiber distributed measurement, in particular to a method for reducing the false alarm rate and missing alarm rate of a phase sensitive optical time domain reflection sensor. Background technique [0002] The phase-sensitive optical time-domain reflectometry sensor is a kind of optical fiber distributed disturbance sensor, which can be sensitive to the disturbance at any point on the sensing fiber and give the location information of the disturbance. Theoretically, it can be measured as a function of optical fiber position information, and replace the traditional sensor array of hundreds of dots with a single optical fiber. The phase-sensitive optical time-domain reflectometry sensor has many advantages such as long monitoring distance, low construction cost, no electromagnetic interference, no need for external power supply, and adapting to complex terrain environments. It is especially suitable for long-di...

AI Technical Summary

Problems solved by technology

[0016] Multiplexing the phase-sensitive optical time domain reflectance sensor with other disturbance sensors can provide new data sources to supplement or correct the detection results, and reduce the false alarm rate and missed alarm rate of the sensor to a certain extent, but it will inevitably increase the system hardware cost, and the data processing method is to dig into the single data of the phase-sensitive optical time-domain reflectometry sensor, lacking redundant and complementary data support

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